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cmd/tailscaled: add TS_DEBUG_BACKEND_DELAY_SEC for testing async startup

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This adds an envknob to make testing async startup more reproducible.
We want the Windows GUI to behave well when wintun is not (or it's
doing its initial slow driver installation), but during testing it's often
too fast to see that it's working. This lets it be slowed down.

Updates #6522

Change-Id: I6ae19f46e270ea679cbaea32a53888efcf2943a7
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
This commit is contained in:
Brad Fitzpatrick 2022-11-28 21:07:33 -08:00 committed by Brad Fitzpatrick
parent 256ba62e00
commit 0a10a5632b
1 changed files with 10 additions and 0 deletions
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10
cmd/tailscaled/tailscaled.go
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@ -416,6 +416,16 @@ func startIPNServer(ctx context.Context, logf logger.Logf, logid string) error {
go func() {
t0 := time.Now()
if s, ok := envknob.LookupInt("TS_DEBUG_BACKEND_DELAY_SEC"); ok {
d := time.Duration(s) * time.Second
logf("sleeping %v before starting backend...", d)
select {
case <-time.After(d):
logf("slept %v; starting backend...", d)
case <-ctx.Done():
return
}
}
lb, err := getLocalBackend(ctx, logf, logid)
if err == nil {
logf("got LocalBackend in %v", time.Since(t0).Round(time.Millisecond))